Ore-screening device



March 10. 1925. 1,529,370

G. NELSON ORE SCREENING DEVICE Filed May 27, 1924 2 Sheets-Sheef 1 March 10.1925. 7 1,529,370

G. NELSON I ORE SCREENING DEVICE Filed May 27, 1924 2 Sheets-Sheet 2 Snow Woo Gus Nels aw.

Emma;

Mar. 119, 132%.

GU25 Nansen, F DOUGLAS, AREZQNA.

@PW- snnnmmre Application "filed May 27, 19241.

To all whom it may concern:

Be it known that 1, Gus Nansen, a citizen of the United States, residing at Douglas, in the county'of Cochise and State of Ari- 1 zone, have invented certain new and useful ores but which also may be utilized for screening coal, gravel, and other similar material.

The main object of the invention is to arrange a series of agitating arms between the bars of a grizzly screen and to give the bars a cross section which will permit the material to fall through the screen Without sticking.

Another object of the invention is to arrange a bafile upon which the material to be screened is delivered and to vibrate the battle in order to facilitate the passing of the material from the same to the screen.

In the accompanying drawings, one embogiment of the invention is illustrated, an

Figure 1 is a vertical section of the screenin? device;

higure 2 is a front elevation of Figure 1 partly in section;

Figure 3 is a perspective view of a double agitating arm;

Figure 4 is a partial transverse section along line 4- 1 of Figure 1 and in larger scale, and

Figure 5 is a plan view of the baffle plate.

In the drawings, reference numeral represents a hopper in which the screen is mountedland into which the screened material falls after passing through the screen. This hopper is funnel-shaped and terminates in a narrow spout at its. lower end from which the fine screened material is delivered to be,carried away. Between the side walls 12 of the hopper a shaft 13 is revolubly mounted, the ends of the shaft projecting beyond the walls 12 and resting in suitable bearings 14: and 15, a belt pulle 16 for revolving the shaft being secure on one end thereof. The portion of the shaft situated between the two side walls 12 is preferably of square cross section or may be shaped in any other suitable man ner to rigidly carry the agitating arms 17. As shown in the drawings the agitating arms 17 are'arranged in pairs extending Serial no. 716,182.

in diametrically opposite directions from a central hub 18 having a square opening-19 fitting on the square portion of the shaft. The ends of the arms '17 terminate in bent fingers 20. The arms are'rnounted in such a manner on the shaft that the arcuate surfaces 21 of the fingers are presented in the direction of rotation as indicated by the arrow X in Figure 1.

The screen 22 consists of a plurality of bars 23 spaced from each other and arranged parallel in vertical planes transversely to the axis of the shaft 13. As best seen in Figure 1 the contour of the bars practically follows the outline of the letter S, commencing at the "upper end of each bar with a short curved portion 24 bent downwardly and merging into an upwardly bent arcuate portion 25 swung from a radius centered in the axis of the shaft 13.. The lower end of the bar terminates in a straight inclined portion 26 extending a short distance below the shaft 13. As best seen in Figure 2, the cross section of eachbar is oval with rounded ends connected by short flat portions. In this manner a screen is formed having narrow spaces between the bars which widen quickly in a downward direction so that the material will not be caught between two bars and in case it should stick slightly, the advancing agitating arms will loosen it. As also indicated in this figure, the agitating arms are mounted on the revolving shaft 13 alternately in two diametrical planes situated at right angles to each other. This arrangement is made so that the apparatus will run easier because in this manner every alternate arm will contact with the material while the other arms are idle.

The sides of the screen 22 are formed by special bars 27, the outer sides of which consist of deep flanges 28 secured to the side walls 12 of the hopper by means of screws 29 or the like and the lower portions of which are reinforced, as at 30, and have substantially the same cross section as half of the regular screen bars 23. At the upper and lower ends of all the bars 23 and 28 are provided supporting brackets 31 and 32 riveted or bolted to the side walls 12 of the hopper, as best seen in El ure 1, and the bars 23 and 28 are suitably attened on their under side, as at 33, to rest on the brackets and are secured thereto by screws 34.

Across the upperarcuate portions 24 of the screen bars is provided a baflie plate 35.

cause the apparatus to stop.

which has a profile coinciding with the arcuate portions 24 of the barssoas to fit snugly over the same. The upper end of this bafile plate is secured to hinges 36 pivoted on a rod 37 extending across the hopper and secured therein by nuts. The baffle plate 35 has a plurality of perforations 38 and the lower edge of the plate is toothed, as at 39,-the teeth being arranged so'that the fingers 20 register with the spaces be tween the teeth. The bottoms 40 of these spaces, however, extend beyond the periph eral line 41, defining the path of the fingers 20, so that whenever the fingers approach the baffle plate they will strike the edge thereof and slightly raise the same, thereby giving the bafiie plate 35 an oscillatory movement around the axis of the rod 37 as indicated by dotted lines in Figure 1. As also indicated in this figure the middle portion 25 of each screen bar is arched in such a manner that the fingers 20 project above the same during the screening operation.

To the rear of the upper edge of the baffle plate 35 is mounted a drum 42 on a shaft that is to say, to prevent the ore or material to be screened from bein dumped directly on the bars. vent the ore from sticking between the bars as it might do if dumped from the belt 44 directly upon the arcuate end portion 24 of the bars. In other words, when the fingers are rising between'the bars there is no possibility of rocks sticking to prevent the forward travel of the fingers 20'and The third function of the bafiie plate is to agitate the ore and spread itover the entire width of the machine. This is caused by the raising and lowering of the edge of the plate as the fingers strike it. Theapertures in the plate are provided in order to permit the finest part of the material to fall through the same before entering the screen proper. Rocks or lumps, too large to pass through the screen are pushed a 011g the same and dumped down on the straight end portions 26 of the bars.

It is evident: that other sections than oval may be used for the screen bars as long as the lower sides are narrower than the upper or middle portions of the bars.

In some cases, a flywheel 50 is provided on one end of the shaft 13 to promote the even running of the device. This arrangement A second auction is to pre-- is particularly desirable when heavy material in big lumps is to be treated.

Having thus described the invention, what is claimed as new is:

1. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, screen bars between which said arms are adapted to travel, and a movable balli'e plate mounted at the entering side of the screening device and adapted to be actuated by said arms.

2. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, screen bars between which said arms are adapted to travel, a baffle plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by said arms, and means for delivering material to be screened to said bafie plate. I

3. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, parallel screen bars between which said arms are adapted to travel, a bafie plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by. said arms, and means for delivering material to be screened to said bafile plate, said, screen bars each haiving a cross section narrowing on itsunder s1 e.

4. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, screen bars between which said arms are adapted to travel, a bafiie plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by said arms, and means for delivering material to be screened to said bafile plate, said bars having a substantially oval cross section.

5. Ina screening device, a hopper, a shaft rerolubl mounted therein, agitating arms mounte on said shaft, parallel screen bars between which said arms are adapted to travel, a baffle plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by said arms, and

means for delivering material to be screened. to said baflie plate, said agitating armsbeing constructed in pairs extending in radially opposite directions from the axis of said shaft.

6. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, parallel screen bars between which said arms are adapted to travel, a baflle plate pivotally mounted at the entering side of\ the screening device and adapted to be oscillated by said arms, and means for delivering material to be screened to said bafile plate, said agitating arms being constructed in pairs extending in radially opposite directions from the axis of said shaft, said arms terminating with fingers arched away from the direction of travel of said arms.

7. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, parallel screen bars between which said arms are adapted to travel, a bafie plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by said arms, and

r means for delivering material to bescreened to said bafiie plate, said agitating arms being constructed in pairs extending in radially opposite directions from the axis of said shaft, said arms terminating with fingers arched away from the direction of travel of said arms and adapted to extend above the main portion of the bars.

8. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, parallel screen bars between which said arms are adapted to travel, a battle plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by said arms, and means for delivering material to be screened to said bathe plate, said agitating arms being 'constructed in pairs extending in radially opposite directions from the axis of said shaft, said arms terminating with fingers arched away from the direction of travel of said arms and adapted to extend'above the main portion of the bars, the outermost of said screen bars being provided with upstanding flanges forming guides for the material to be screened.

9. In a screening device, a hopper, a shaft revolubly mounted therein, agitating arms mounted on said shaft, parallel screen bars between which said arms are adapted to travel, a baflle plate pivotally mounted at the entering side of the screening device and adapted to be oscillated by said arms, and

means for delivering material to be screened to said bafile plate, said bars having a substantially oval cross section, said agitating arms being constructed in "pairs extending in radially opposite directions from the axis of said shaft, said arms terminating with \fingers arched away from the direction of travel of said arms and adapted to extend above the main portion of the bars, the outermost of said screen bars being provided with upstanding) flanges forming guides for the material to e screened.-

In testimony whereof I aflix In}? signature.

GUS NELSO [L. a] 

